| 摘要 |
A rotary damper includes a housing having an outer cylinder, an inner cylinder coaxially disposed inside the outer cylinder, and a bottom plate closing one end side of the outer cylinder and the inner cylinder, to form an annular liquid chamber with a viscous fluid therein, and a rotor including a cylindrical blade portion rotatably received in the liquid chamber. An annular locking groove extends circumferentially in a first portion at an outer peripheral surface of the inner cylinder, or a second portion facing the first portion on an inner peripheral surface of the blade portion. A locking convex portion projects from the other of the first portion or the second portion, and locked in the locking groove. An annular inside seal member is interposed between the inner cylinder and the blade portion, and an annular outside seal member is interposed between the outer cylinder and the blade portion. |
| 主权项 |
1. A rotary damper, comprising:
a housing including an outer cylinder having a predetermined axis line, an inner cylinder coaxially disposed inside the outer cylinder, and a bottom plate closing one end of the housing in an axis line direction between the outer cylinder and the inner cylinder, wherein an annular liquid chamber is defined by the outer cylinder, the inner cylinder, and the bottom plate, and a viscous fluid is filled in the liquid chamber; a rotor including a cylindrical blade portion rotatably received in the liquid chamber coaxially with the outer cylinder, and a flange extending radially outwardly from an upper end of the blade portion, and arranged outside of the housing and above an upper surface of the outer cylinder; an annular locking groove extending in a circumferential direction in one of either a first portion which is an outer peripheral surface of the inner cylinder and is located at an end edge portion on a side opposite to a bottom plate side, or a second portion facing the first portion on an inner peripheral surface of the blade portion; a locking convex portion projecting from the other of either the first portion or the second portion, and locked in the locking groove so as to control a relative movement in the axis line direction between the housing and the rotor; an annular inside seal member interposed between a portion on the outer peripheral surface of the inner cylinder and on the bottom plate side more than the first portion, and the inner peripheral surface of the blade portion; and an annular outside seal member interposed between a vicinity of the other end of the housing in the axis line direction on an inner peripheral surface of the outer cylinder, and an outer peripheral surface of the blade portion, wherein the inner cylinder includes a slit extending between the end edge portion and a portion above the inside seal member through the annular locking groove or the convex portion so that a part of the inner cylinder elastically deforms radially inwardly to receive and hold the rotor, and the end edge portion of the inner cylinder is positioned inward of an upper surface of the flange so that the slit of the inner cylinder is positioned inward of the flange. |
